CN114141496B - On-load voltage regulating transformer - Google Patents
On-load voltage regulating transformer Download PDFInfo
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- CN114141496B CN114141496B CN202111469305.3A CN202111469305A CN114141496B CN 114141496 B CN114141496 B CN 114141496B CN 202111469305 A CN202111469305 A CN 202111469305A CN 114141496 B CN114141496 B CN 114141496B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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Abstract
The application relates to an on-load tap changing transformer, comprising: a voltage regulating side main winding, a voltage regulating winding and a gear adjusting component; the voltage regulating winding is provided with N.times.M tapping taps; m is the number of tap gears inherent on the conventional voltage regulating winding; n is a positive integer, N.M tapping taps divide a voltage interval on the voltage regulating winding into N.M equidistant voltage adjustment amounts, and the equidistant voltage adjustment amounts are not more than the highest rated inter-stage voltage of the voltage regulating winding; the main winding at the voltage regulating side is connected with the fixed end of the gear adjusting component, and the movable end of the gear adjusting component is connected with a tapping tap in the voltage regulating winding; when the gear voltage is required to be regulated, the gear regulating component executes automatic passing on the tapping tap corresponding to the N-1 gear. The method can reduce the times of actual voltage regulation operation, thereby reducing errors possibly occurring in the operation and ensuring the accuracy of voltage regulation.
Description
Technical Field
The application relates to the technical field of transformer manufacturing, in particular to an on-load voltage regulating transformer.
Background
Along with the rapid development of the construction of the national extra-high voltage alternating current/direct current power grid, higher requirements are put forward on the voltage regulating capability of an extra-high voltage transformer, and the transformer is required to realize on-load voltage regulating to control electric energy transmission more flexibly and reduce power failure time, so that the transformer has more tapping gear numbers and larger voltage regulating tapping range, and the electric energy quality is better. The extra-high voltage transformer has the characteristics of high voltage on the voltage regulating side and large voltage difference between each tap, namely the interstage voltage, so that when the extra-high voltage transformer is subjected to on-load voltage regulation, proper on-load tap changers cannot be selected due to overlarge interstage voltage, and the electric energy quality is affected.
At present, in a general extra-high voltage transformer, an extra-high voltage autotransformer regulates voltage at a medium voltage 500 kilovolt side, and rated voltage and tapping range of the voltage regulating side are 525+/-4 x 1.25%kV; the extra-high voltage generator is used for regulating the voltage of the high voltage 1000 kilovolt side, and the rated voltage and the tapping range of the voltage regulating side are 1100-4 x 1.25%. The extra-high voltage transformer has the characteristic that the voltage difference (stage voltage) between each tapping is large due to the high voltage at the voltage regulating side, and the parameter is an important technical parameter of the switch. Therefore, the existing extra-high voltage transformer generally adopts a non-excitation voltage regulation mode, and rarely adopts an on-load voltage regulation mode. The non-excitation voltage-regulating tapping switch switches the contact under the condition that the transformer is not electrified, the switching process does not generate electric arcs, and the problem of extinguishing the electric arcs does not need to be considered, so that the stage voltage of the non-excitation voltage-regulating tapping switch can be higher, and the requirement of the extra-high voltage transformer on the switching stage voltage can be met. On-load tap changers need to switch contacts under the condition that a transformer is electrified, an arc is generated between the switch contacts due to the existence of an inter-stage voltage, and the higher the stage voltage is, the larger the arc energy is, and the more difficult the arc is to extinguish. And the inter-stage voltage of the on-load voltage regulating tap changer is only 50% or even lower of the non-exciting voltage regulating inter-stage voltage. However, when the transformer is used for non-excitation voltage regulation, because the inter-stage voltage is too high, when the voltage regulation is carried out, the gear number is few, the voltage regulation tapping range is small, meanwhile, the switch gear is completed after the transformer is powered off, the transformer is put into operation, the operation is complex, errors are easily generated during the power off increasing process, and the accurate voltage regulation operation cannot be ensured.
Therefore, the existing on-load voltage regulating transformer has the problem of low voltage regulating precision.
Disclosure of Invention
In view of the above, it is necessary to provide an on-load voltage regulating transformer having high voltage regulating accuracy.
The application provides an on-load voltage regulating transformer, which comprises a voltage regulating side main winding, a voltage regulating winding and a gear regulating assembly;
the voltage regulating winding is provided with N.times.M tapping taps; m is the number of tap gears inherent on the conventional voltage regulating winding; n is a positive integer, N.M tapping taps divide a voltage interval on the voltage regulating winding into N.M equidistant voltage adjustment amounts, and the equidistant voltage adjustment amounts are not more than the highest rated inter-stage voltage of the voltage regulating winding;
the main winding at the voltage regulating side is connected with the fixed end of the gear adjusting component, and the movable end of the gear adjusting component is connected with a tapping tap in the voltage regulating winding;
when the gear voltage is required to be regulated, the gear regulating component executes automatic passing on the tapping tap corresponding to the N-1 gear.
In one embodiment, the on-load tap changing transformer further comprises: the control assembly is connected with the gear adjusting assembly;
the control component is used for counting the number of tapping taps which pass through the gear adjusting component, and when the number of tapping taps which pass through is smaller than N, the control component outputs a first control signal to the gear adjusting component; when the number of the passed tapping taps reaches N, the control component outputs a second control signal to the gear adjusting component, and the first control signal is used for indicating automatic passing; the second control signal is used to indicate a stop.
In one embodiment, the voltage regulating side main winding comprises a separate winding.
In one embodiment, the voltage regulating winding includes a voltage regulating winding head end, a voltage regulating winding end, and n×m tap taps disposed between the voltage regulating winding head end and the voltage regulating winding end, the n×m tap taps bisecting the voltage regulating winding into a plurality of equal turns.
In one embodiment, the gear adjusting assembly comprises a tap changer, wherein the fixed end of the tap changer is connected with the tail end of the independent winding, and the movable end of the tap changer is selectively connected with different tap taps.
In one embodiment, the voltage regulating side main winding further comprises an autotransformer winding.
In one embodiment, the voltage regulating winding includes a voltage regulating winding head end, a voltage regulating winding end, and n×m tap taps disposed between the voltage regulating winding head end and the voltage regulating winding end, the n×m tap taps bisecting the voltage regulating winding into a plurality of equal turns.
In one embodiment, the gear adjusting assembly comprises a tap changer, wherein the fixed end of the tap changer is connected with the tail end of the self-coupling winding, and the movable end of the tap changer is selectively connected with different tap taps.
In one embodiment, the tap changer includes a positive and negative tap changer.
In one embodiment, the n×m tap taps are arranged in a circular equidistant configuration.
According to the on-load voltage regulating transformer, on one hand, the N.times.M tapping taps are arranged on the voltage regulating winding, the tapping taps of the voltage regulating winding are increased while the voltage regulating range is not changed, tapping gear numbers are correspondingly increased, the voltage on the voltage regulating winding is divided into N.times.M equidistant voltage regulating amounts, each voltage regulating amount is 1/N times of the inherent tapping gear numbers on the conventional voltage regulating winding, and more tapping gear numbers exist, so that the voltage regulating is finer; on the other hand, the tapping tap corresponding to the N-1 gear is automatically passed, namely, when one voltage regulation operation is carried out, the on-load voltage regulator can automatically pass through the gear until reaching the position of the N gear, so that the actual switch gear regulation operation times are consistent with the conventional voltage regulation gear, the actual voltage regulation operation times are reduced, errors possibly occurring in the operation are reduced, and the voltage regulation accuracy is ensured.
Drawings
FIG. 1 is a schematic diagram of an on-load tap changing transformer according to one embodiment;
FIG. 2 is a schematic diagram of control logic during a shift operation of an on-load tap changer according to one embodiment;
FIG. 3 is a schematic diagram of an on-load voltage regulation connection for an independent winding in one embodiment;
fig. 4 is a schematic diagram of an on-load voltage-regulating connection principle of an autotransformer in another embodiment.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
In one embodiment, as shown in fig. 1, an on-load tap changer is provided, comprising a tap side main winding (1), a tap winding (2) and a gear adjusting assembly (3);
the voltage regulating winding is provided with N.times.M tapping taps; m is the number of tap gears inherent on the conventional voltage regulating winding; n is a positive integer, N.M tapping taps divide a voltage interval on the voltage regulating winding into N.M equidistant voltage adjustment amounts, and the equidistant voltage adjustment amounts are not more than the highest rated inter-stage voltage of the voltage regulating winding;
the main winding at the voltage regulating side is connected with the fixed end of the gear adjusting component, and the movable end of the gear adjusting component is connected with a tapping tap in the voltage regulating winding;
when the gear voltage is required to be regulated, the gear regulating component executes automatic passing on the tapping tap corresponding to the N-1 gear.
The voltage regulating winding is an important component for regulating voltage in the on-load voltage regulating transformer, and the required voltage can be obtained by regulating the voltage on the voltage regulating winding; the tapping tap is used for adjusting voltage, and the number of turns of the voltage-adjusting winding is changed by changing the connection of the tapping tap, so that the output voltage of the transformer is adjusted; the gear adjustment assembly is used for identifying the number of split taps. Specifically, in the on-load voltage regulating transformer, the tail end of the voltage regulating side main winding (1) is connected with the voltage regulating winding (2), the fixed end of the gear regulating component (3) is connected with the voltage regulating side main winding, the movable end is connected with a tap in the voltage regulating winding, and the movable end of the gear regulating component is connected with the tap on the voltage regulating winding by changingSplicing jointInter-stage voltage on the voltage regulating winding is changed to carry out gear voltage regulation so as to realize voltage regulation. Meanwhile, when the voltage is regulated, the gear regulating component can also identify the number of connected tapping taps, and when the number of the tapping taps is identified to reach a preset gear, the gear is automatically controlled to pass through, so that the actual voltage regulation requirement is met.
Further, since one tap corresponds to one tap position, the tap position of the on-load tap-changing transformer can be obtained to be N times of that of a conventional transformer, but the total tap voltage regulating range is not changed, and under the condition that the total tap voltage regulating range is not changed, N x M tap positions are set, the number of tap positions is increased, the voltage interval on the voltage regulating winding is averagely divided into N x M equidistant voltage regulating amounts, and meanwhile, the inter-stage voltage on the voltage regulating winding of the on-load tap-changing transformer has the highest rated voltage, and each equal voltageThe pitch voltage adjustment must not be greater than the highest rated inter-stage voltage. In addition, when gear voltage adjustment is needed, the gear adjusting component executes an automatic passing command on the tapping tap corresponding to the N-1 gear. If the voltage-regulating tapping range of the conventional transformer is + -A+B% (or-A+B%), i.e. the tap position number of the voltage-regulating tap is A, and the voltage-regulating quantity of each tap is B%, the actual tap position number of the voltage-regulating winding is designed according to N times of the tap position number A of the conventional transformer, and at the same time the voltage-regulating quantity of each tap position of the voltage-regulating winding is 1/N times of the conventional transformer, i.e. the voltage-regulating tapping range is changed to + -A/N (B/N) (or- (A/N) B/N)%. For further explaining the technical scheme, the voltage U of the head end A of the main winding is exemplified as the following N For example, the voltage regulation range of the on-load voltage regulating switch is ± 8×1.25%, the number of tap steps is 8, and the voltage regulation amount of each tap is 1.25%. Thus, the full range voltage of the entire voltage regulating winding25% ≡57.74kV, adjacent inter-stage voltages of the voltage regulating winding and the tap switch are22kV, but the highest rated voltage of the existing on-load voltage regulating tapping switch is 4.0kV, the rated voltage is limited by the capacity of the level of the switch, and the rated voltage can be reduced under the condition of increasing passing current, according to the on-load voltage regulating method of the invention, the voltage regulating tapping gear is set to be 2 times of that of a conventional transformer, namely 16 tapping gears, and meanwhile, the voltage regulating quantity of each tapping is set to be 0.625%, namely +/-16 multiplied by 0.625%, the main winding is not changed, and the voltage of the whole range of the voltage regulating winding is increased>The adjacent inter-stage voltage of the voltage regulating and dividing winding and the tap switch is +.> Is reduced to half of the original value.
According to the on-load voltage regulating transformer, on one hand, the N.times.M tapping taps are arranged on the voltage regulating winding, the tapping taps of the voltage regulating winding are increased while the voltage regulating range is not changed, tapping gear numbers are correspondingly increased, the voltage on the voltage regulating winding is divided into N.times.M equidistant voltage regulating amounts, each voltage regulating amount is 1/N times of the inherent tapping gear numbers on the conventional voltage regulating winding, and more tapping gear numbers exist, so that the voltage regulating is finer; on the other hand, the tapping tap corresponding to the N-1 gear is automatically passed, namely, when one voltage regulation operation is carried out, the on-load voltage regulator can automatically pass through the gear until reaching the position of the N gear, so that the actual switch gear regulation operation times are consistent with the conventional voltage regulation gear, the actual voltage regulation operation times are reduced, errors possibly occurring in the operation are reduced, and the voltage regulation accuracy is ensured.
In one embodiment, the on-load tap changing transformer further comprises: the control assembly is connected with the gear adjusting assembly; the control component is used for counting the number of tapping taps which pass through the gear adjusting component, and when the number of tapping taps which pass through is smaller than N, the control component outputs a first control signal to the gear adjusting component; when the number of the passed tapping taps reaches N, the control component outputs a second control signal to the gear adjusting component, and the first control signal is used for indicating automatic passing; the second control signal is used to indicate a stop.
Wherein the control component is a component for counting the number of tapping points and transmitting a control signal. Specifically, when gear pressure adjustment is performed, the control component counts the number of tapping taps which the gear adjustment component passes through, and when the number of tapping taps which the gear adjustment component passes through is smaller than N, the control component outputs a first control signal which is used for indicating automatic passing through to the gear adjustment component, and an automatic passing command is executed; when the number of the through tapping taps reaches N, the control component outputs a second control signal for indicating stopping to the gear adjusting component to finish one-time voltage adjusting operation. For further explanation of the present technical solution, examples are illustrated as shown in fig. 2: (4) the method comprises the steps that (1) a fixed tapping tap capable of being resided, (5) a non-resided fixed tapping tap, (6) a movable tapping tap, wherein an inherent tapping gear M=8 is arranged on a conventional voltage regulating winding, 2×8=16 tapping taps are arranged on the voltage regulating winding of the on-load voltage regulating transformer, N is an integer of 2, when one-time gear voltage regulation is carried out, a control component counts the number of tapping taps which pass through, when the movable tapping tap is firstly regulated to a gear 1a from a gear 1, the tapping tap 1a at the moment is the non-resided fixed tapping tap, so that the control component outputs a first control signal to a gear regulating component, an automatic passing command is executed at the gear 1a, then the automatic passing command is regulated to a gear 2 from the gear 1a, the tapping tap 2 reaches the preset n=2, the gear regulating component stops the gear regulating operation when the second control signal is carried out, and the gear regulating component completes one-time voltage regulation operation in practice, namely, when two-time voltage regulation is carried out in the actual implementation of the on-load voltage regulating transformer. Similarly, N is an integer 4, 4×8=32 tapping points are set on the voltage regulating winding of the on-load voltage regulating transformer, when the number of tapping points which pass through is counted by the control component and is firstly regulated to the gear 1a from the gear 1, the tapping point at this time is the first tapping point 1a, so the control component outputs a first control signal to the gear regulating component, an automatic passing command is executed at the gear 1a, then the tapping point at this time is the second tapping point 1b after regulating to the gear 1b, so the control component continues to output the first control signal for executing the automatic passing to the gear regulating component, then the tapping point at this time is the third tapping point after regulating to the gear 1d from the gear 1b, and the corresponding 3 rd gear, so the control component still outputs the first control signal for executing the automatic passing to the gear regulating component until the tap at this time is regulated to the gear 1c from the gear 1d, the tapping point is the 4 th tapping point, the tap is the second tapping point corresponding to the preset gear 4, the tap at this time is the first tapping point, the tap point at this time is regulated to the gear 4 d, and the tap point at this time is regulated to the gear 4=3, the actual regulating component stops being reached, and the operation is stopped, and the regulation is completed.
In this embodiment, the number of tap taps that the gear adjusting assembly has passed is counted by the control assembly, automatic passing is performed on the gear corresponding to tap taps smaller than N, until the number of tap taps reaches the preset value of N, automatic passing is stopped, and an actual primary voltage adjustment operation is completed, so that setting on secondary control logic during the on-load voltage adjustment tap changer gear adjustment operation can be realized, the number of actual voltage adjustment operations is consistent with the number of conventional voltage adjustment gears, the number of actual voltage adjustment operations is reduced, errors possibly occurring in the operation are reduced, and the accuracy of voltage adjustment is ensured.
In one embodiment, the voltage regulating side main winding comprises an independent winding.
Specifically, the end of the main winding on the voltage regulating side is connected with the voltage regulating winding, and for the type of the main winding on the voltage regulating side, an independent winding can be included, when the main winding on the voltage regulating side is the independent winding, the voltage on the side of the high voltage winding is regulated, the voltage at the head end of the winding is 1000kV, the voltage regulating range is +/-8×1.25% for example, if 8 tapping taps are arranged on the voltage regulating winding according to the conventional method, the tap number of the voltage regulating tap is 8, and the voltage regulating amount of each tapping is 1.25%, thus the voltage of the whole range of the voltage regulating winding is the full range of the voltageThe adjacent inter-stage voltages of the voltage regulating winding and the tap changer areHowever, in the existing on-load tap changers, the highest rated voltage is 4.0kV, and the rated voltage is reduced when the passing current increases due to the limitation of the stage capacity. However, if the voltage-regulating winding is set to 16 tap points, namely + -16×0.625%, as shown in fig. 3, (1) is the voltage-regulating side main winding, (2) is the voltage-regulating winding, and (3) is the tap switch, wherein the voltage-regulating side main winding (1) is unchanged, and the full range voltage of the whole voltage-regulating winding (2) is ±>X 0.625% ≡57.74kV is unchanged, but by setting the voltage regulating winding to 16 tapping points, since the total voltage regulating range is unchanged, the voltage regulating amount of each tapping point at the moment is correspondingly set to 0.625%, and the adjacent inter-stage voltage of the voltage regulating winding (2) and the tapping switch (3) is reduced to->The problem of excessively high stage voltage is solved. When the on-load voltage regulation tapping switch is actually operated to regulate the voltage, the operation is carried out according to one regulation of every 2 gears, and the actual voltage regulation requirement of +/-8 multiplied by 1.25 percent is realized.
In one embodiment, the voltage regulating winding includes a voltage regulating winding head end, a voltage regulating winding end, and n×m tap taps disposed between the voltage regulating winding head end and the voltage regulating winding end, the n×m tap taps bisecting the voltage regulating winding into a plurality of equal turns.
Specifically, the voltage regulating winding comprises a voltage regulating winding head end, a voltage regulating winding tail end and N x M tapping taps arranged between the voltage regulating winding head end and the voltage regulating winding tail end, the voltage regulating winding is divided into a plurality of parts with equal turns by the N x M tapping taps, the voltages of the corresponding parts are equal, the total turns of the voltage regulating winding are kept unchanged and are consistent with the total turns of the conventional voltage regulating winding, the total turns are divided by the N x M tapping taps, the obtained parts with equal turns are N times of the conventional voltage regulating winding, and the voltage of the corresponding parts is 1/N times of the voltage of the conventional voltage regulating winding. Similarly, taking the voltage of the head end of the winding as 1000kV and the voltage regulating range as + -8 multiplied by 1.25%, the conventional method is to arrange 8 tapping taps on the voltage regulating winding to divide the voltage regulating winding into 8 parts with equal turns, and the voltage of each part isBecause the voltage is limited by the highest rated inter-stage voltage in the prior art and cannot meet the actual voltage regulating requirement, 2 multiplied by 8=16 tapping taps are arranged on the voltage regulating winding, the voltage regulating winding is divided into 16 parts with equal turns, and under the condition that the total turns are unchanged, namely the total voltage regulating rangeThe circumference is unchanged so that the voltage of each part becomes 1/2 times that in the conventional method, namelyThe obtained inter-stage voltage is smaller than the rated inter-stage voltage, and the actual voltage regulating requirement can be met.
In this embodiment, the n×m tapping points on the voltage-regulating winding divide the voltage-regulating winding into a plurality of parts with equal turns, the obtained parts with equal turns are N times of the conventional voltage-regulating winding, the tapping gear number is increased by a whole multiple, and the voltage corresponding to each tapping gear is 1/N times of the conventional voltage-regulating winding, and since the total number of turns is unchanged, that is, the total voltage of the voltage-regulating winding remains unchanged, the voltage regulation can be finer.
In one embodiment, the gear adjusting assembly comprises a tap changer, wherein a fixed end of the tap changer is connected with the tail end of the independent winding, and a movable end of the tap changer is selectively connected with different tap taps.
The tap switch is a main component of the on-load voltage regulating transformer, after a plurality of tap taps are led out from a voltage regulating winding in the on-load voltage regulating transformer, the switch is switched from one tap to the other tap under the condition of not changing load current so as to change the effective turns, namely the voltage ratio of the on-load voltage regulating transformer, thereby realizing the purpose of voltage regulation; specifically, the fixed end of the tapping switch is connected with the tail end of the independent winding, and the movable end is selectively connected with different tapping taps to form a complete electric path so as to realize the function of on-load voltage regulation. In one embodiment, the voltage regulating side main winding comprises an autotransformer winding.
Wherein the autotransformer winding is a combination of a plurality of windings that are autotransformed. Specifically, the voltage regulating side main winding includes an autotransformer winding in addition to the independent winding. When the main winding at the voltage regulating side is an autotransformer winding, the voltage is regulated at the medium voltage winding side, the voltage at the head end of the medium voltage winding is 500kV, and the voltage regulating range of the on-load voltage regulating switch is + -8 multiplied by 1.25 percent. Because the single-phase capacity of the transformer reaches 1000MVA, the rated current of the required switch reaches 2400A, if the voltage regulating winding is set to 8 tapping according to the conventional method, the voltage regulating winding and the tapping are considered to be variable magnetic flux voltage regulating by the transformerThe adjacent inter-stage voltage of the switch reaches 7.67kV. Similar to the embodiment when the voltage regulating side main winding is an independent winding, if the voltage regulating winding is set to 16 taps, as shown in fig. 4, (1) is the voltage regulating side main winding, (2) is the voltage regulating winding, and (3) is the tap switch, wherein the voltage regulating side main winding (1) is unchanged, and the full range voltage of the whole voltage regulating winding (2)By setting the voltage-regulating winding to 16 tap points, the voltage regulating quantity of each tap point is set to 0.625% correspondingly, and the adjacent inter-stage voltage of the voltage-regulating winding (2) and the tap switch (3) is reduced to +.>The problem of excessively high stage voltage is solved. When the on-load voltage regulation tapping switch is actually operated to regulate the voltage, the operation is carried out according to one regulation of every 2 gears, and the actual voltage regulation requirement of +/-8 multiplied by 1.25 percent is realized.
In one embodiment, the voltage regulating winding includes a voltage regulating winding head end, a voltage regulating winding end, and n×m tap taps disposed between the voltage regulating winding head end and the voltage regulating winding end, the n×m tap taps bisecting the voltage regulating winding into a plurality of equal turns.
Specifically, the voltage regulating winding comprises a voltage regulating winding head end, a voltage regulating winding tail end and N x M tapping taps arranged between the voltage regulating winding head end and the voltage regulating winding tail end, the voltage regulating winding is divided into a plurality of parts with equal turns by the N x M tapping taps, the voltages of the corresponding parts are equal, the total turns of the voltage regulating winding are kept unchanged and are consistent with the total turns of the conventional voltage regulating winding, the total turns are divided by the N x M tapping taps, the obtained parts with equal turns are N times of the conventional voltage regulating winding, and the voltage of the corresponding parts is 1/N times of the voltage of the conventional voltage regulating winding. Similarly, taking the voltage of the head end of the winding as 1000kV and the voltage regulating range as + -8 multiplied by 1.25%, the conventional method is to arrange 8 tapping taps on the voltage regulating winding to divide the voltage regulating winding into 8 parts with equal turns, and the voltage of each part isBecause the voltage between the highest rated stages in the prior art is limited by the voltage, the actual voltage regulating requirement cannot be met, 2 multiplied by 8=16 tapping taps are arranged on the voltage regulating winding, the voltage regulating winding is divided into 16 parts with equal turns, and under the condition that the total number of turns is unchanged, namely the total voltage regulating range is unchanged, the voltage of each part is 1/2 times that of the conventional method, namelyThe obtained inter-stage voltage is smaller than the rated inter-stage voltage, and the actual voltage regulating requirement can be met.
In this embodiment, the n×m tapping taps on the voltage-regulating winding divide the voltage-regulating winding into a plurality of parts with equal turns, the obtained parts with equal turns are N times of the conventional voltage-regulating winding, the tapping gear number is increased by a whole multiple, the voltage corresponding to each tapping gear is 1/N times of the conventional voltage-regulating winding, and because the total number of turns is unchanged, the inter-stage voltage of the voltage-regulating winding is reduced on the premise of not changing the voltage-regulating range by dividing the total number of turns into a plurality of parts with the same turns, so that the on-load voltage-regulating transformer has more tapping gear numbers, the required voltage can be more accurately regulated when on-load voltage regulation is performed, and the accuracy of on-load voltage regulation is improved.
In one embodiment, the gear adjusting assembly comprises a tap changer, wherein a fixed end of the tap changer is connected with the tail end of the self-coupling winding, and a movable end of the tap changer is selectively connected with different tap taps.
The tap switch is a main component of the on-load voltage regulating transformer, after a plurality of tap taps are led out from a voltage regulating winding in the on-load voltage regulating transformer, the switch is switched from one tap to the other tap under the condition of not changing load current so as to change the effective turns, namely the voltage ratio of the on-load voltage regulating transformer, thereby realizing the purpose of voltage regulation; specifically, the fixed end of the tapping switch is connected with the tail end of the self-coupling winding, and the movable end is selectively connected with different tapping taps to form a complete electric path so as to realize the function of on-load voltage regulation.
In one embodiment, the tap changer includes a positive and negative tap changer.
Specifically, the tap switch is a main component of the on-load tap-changing transformer, after a plurality of tap-changing taps are led out from a voltage-regulating winding in the on-load tap-changing transformer, the switch is switched from one tap-changing tap to another tap-changing tap to change the effective turns, i.e. change the voltage ratio of the on-load tap-changing transformer, thereby realizing the purpose of voltage regulation. The tap switch of the on-load voltage regulating transformer mainly comprises a change-over switch with transition impedance and a tap selector without a converter, and the working principle of the on-load voltage regulating transformer mainly depends on the fact that the transformer is in electrified operation, and related workers adopt an electric or manual mode to change the position of a joint and change the number of turns of windings to carry out step voltage regulation. The on-load tap changer of the voltage regulating transformer mainly comprises the following parts: firstly, the main function of the change-over switch is to bear the running of the load current in the transformer, and the change-over switch can automatically and rapidly run according to a preset program. Second, the range selection switch has the meaning of increasing the voltage regulation range of the transformer, so that related staff can selectively select the switch operation modes of positive and negative voltage regulation and coarse and fine voltage regulation. Thirdly, the electric mechanism is a basic power source for carrying out various operation works of the on-load tap changer of the voltage regulating transformer, can be manually operated to carry out the voltage regulating work, and can also be remotely operated to carry out the voltage regulating work of the transformer.
In one embodiment, the n×m tap taps are arranged in a circular equidistant configuration.
Specifically, n×m tap taps are arranged in a circular equidistant manner.
In this embodiment, the n×m tapping taps are arranged at equal intervals in a circular shape, so that the tapping taps have the characteristics of regular arrangement, standardization and agility, and the tapping taps are arranged at equal intervals, so that the total voltage on the voltage-regulating winding can be equally divided into a plurality of equal voltage parts, the actual voltage-regulating requirement can be better met when the gear is regulated, and meanwhile, the command of automatically passing or stopping can be ensured to be executed according to the gear corresponding to the tapping taps orderly, and the actual voltage-regulating effect is prevented from being influenced by arrangement confusion.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. The on-load voltage regulating transformer is characterized by comprising a voltage regulating side main winding, a voltage regulating winding and a gear regulating assembly;
the voltage regulating winding is provided with N.m tapping taps; m is an inherent tapping gear number on a conventional voltage regulating winding; the N is a positive integer, the N.M tapping taps divide a voltage interval on the voltage regulating winding into N.M equidistant voltage adjustment amounts, and the equidistant voltage adjustment amounts are not more than the highest rated inter-stage voltage of the voltage regulating winding;
the main winding at the voltage regulating side is connected with the fixed end of the gear adjusting component, and the movable end of the gear adjusting component is connected with a tapping tap in the voltage regulating winding;
when the gear voltage is required to be regulated, the gear regulating component executes automatic passing on the tapping tap corresponding to the N-1 gear.
2. The on-load step-down transformer of claim 1, further comprising a control assembly coupled to the gear adjustment assembly;
the control assembly is used for counting the number of tapping taps which are passed by the gear adjusting assembly, and when the number of tapping taps which are passed by the gear adjusting assembly is smaller than N, the control assembly outputs a first control signal to the gear adjusting assembly; when the number of taps that have passed reaches N, the control assembly outputs a second control signal to the gear adjustment assembly, the first control signal being for indicating an automatic pass, the second control signal being for indicating a stop.
3. The on-load step-down transformer of claim 1, wherein the step-down side main winding comprises a separate winding.
4. The on-load tap changing transformer according to claim 3, wherein the voltage regulating winding comprises a voltage regulating winding head end, a voltage regulating winding tail end, and N x M tap numbers disposed between the voltage regulating winding head end and the voltage regulating winding tail end, the N x M tap numbers bisecting the voltage regulating winding into a plurality of equal turns.
5. The on-load tap changing transformer of claim 4, wherein the gear adjustment assembly comprises a tap changer, a fixed end of the tap changer being connected with an independent winding end, a movable end of the tap changer being selectively connected with different ones of the tap taps.
6. The on-load step-down transformer of claim 1, wherein the step-down side main winding comprises an autotransformer winding.
7. The on-load tap changing transformer according to claim 6, wherein the voltage regulating winding comprises a voltage regulating winding head end, a voltage regulating winding tail end, and N x M tap numbers disposed between the voltage regulating winding head end and the voltage regulating winding tail end, the N x M tap numbers bisecting the voltage regulating winding into a plurality of equal turns.
8. The on-load tap changing transformer of claim 7, wherein the gear adjustment assembly comprises a tap changer, a fixed end of the tap changer being connected with an end of the autotransformer, a movable end of the tap changer being selectively connected with a different one of the tap taps.
9. The on-load tap changer of claim 5 or 8, wherein the tap changer comprises a positive and negative tap changer.
10. The on-load tap changing transformer of claim 1, wherein the N x M tap-lets are arranged in a circular equidistant configuration.
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